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<DIV><FONT face=Arial size=2>Derek, any good weather yet - what mixes are you
using ?</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=derekkoopowitz@gmail.com href="mailto:derekkoopowitz@gmail.com">Derek
Koopowitz</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=chad@f3acanada.org
href="mailto:chad@f3acanada.org">chad@f3acanada.org</A> ; <A
title=nsrca-discussion@lists.f3a.us
href="mailto:nsrca-discussion@lists.f3a.us">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 10, 2008 11:13
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Joy of
Trim</DIV>
<DIV><BR></DIV>
<DIV>That is great news, Chad. I'm glad to hear that the issues got
resolved.</DIV>
<DIV> </DIV>
<DIV>I'm also very close on my setup... my stab is at 0 and the wings are
almost +.5. The plane comes standard without downthrust and I have since
added some to help with the pull to the canopy in the upline - its almost 100%
but not quite. I think I may still be a little tail heavy and will add
some nose weight when I get a day that is calm - it has been a little breezy
here. Overall my plane is flying much better now as well.<BR><BR></DIV>
<DIV class=gmail_quote>On Thu, Apr 10, 2008 at 8:56 AM, Chad Northeast <<A
href="mailto:chadnortheast@shaw.ca">chadnortheast@shaw.ca</A>> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Guys<BR><BR>A
while back I posted this, and have recently got around to the suggestions.
Both Bryan and Nat said that the TL was far too much negative as the
Twister has -2.5 deg molded into the fuse. So away I went, here is a
copy of the email (just below) I sent to them after my flights to resolve
it.<BR><BR>Before last week you could have never convinced me that you could
get a plane neutral in knife edge without giving up something....well I
officially stand corrected :-) They know their stuff, were right on
the money and the Twister goes pretty much anywhere you point it now without
mixing (except a bit on downline but I think I can get rid of
that).<BR><BR>I gotta say thanks to Bryan and Nat for their help, they were
bang on, and I would suggest to anyone that you give their suggestions and
honest try, I bet you are more than happy with the
results!<BR><BR>Chad<BR><BR>Hey guys,<BR><BR>Well finally got out flying,
good thing too since I am off to NY state<BR>again on Monday :-(<BR><BR>So,
here is where I was, I broke down and bought an inclinometer so I<BR>could
actually measure the plane directly....since I am too lazy to
do<BR>trig.<BR><BR>Engine, as molded is -2.5 but I was at -3.5, wing +0.8,
stab +0.1.<BR><BR>So I got as much of the down out of it as possible which
leaves me at -1,<BR>I can't do any more without shimming the motor further
out for more<BR>clearance spinner to nose ring. I put the wing back to
+0.5 and left the<BR>stab alone.<BR><BR>First flight today, removed the left
rudder KE mix I had (had none on<BR>right rudder), and downline mix.<BR>-
Plane needed a bit of down trim for level, but was pretty close<BR>- Uplines
went to the canopy<BR>- 45 ups inverted pulled over the top fairly hard<BR>-
45 downs upright were pretty decent but still dove a bit - recall
this<BR>was my major beef with previous setup<BR>- knife was pulling to
canopy both ways<BR><BR>Second flight - moved CG back as I have felt that it
was too far forward<BR>in general, and I think you would agree if you saw
where it was.<BR>- more down trim<BR>- Uplines became very close<BR>- knife
both ways was pretty good, really solid with right rudder, and<BR>very very
close on left (slight belly pitch)...probably not worth mixing<BR>out<BR>-
45 downs upright were getting better<BR>- downline mix reduced 2% from
start<BR>- 45 ups inverted better<BR><BR>Third flight - took out 1/2 turn of
incidence, which by trig should put me<BR>at 0.41+ on the wings<BR>- uplines
became perfect, or really close...would need more flights in<BR>various
conditions to nail<BR>- everything else was really close<BR><BR>Fourth
flight - decided to adjust stab since I was carrying a little
up<BR>elevator, so I took 1/2 turn out of adjuster which should being it
close<BR>to 0<BR>- this pretty much sealed it<BR>- uplines are as before,
very very close<BR>- no KE mix - even in the KE loop at high deflections its
really, really<BR>good<BR>- took another 1% out of my downline mix (I am at
2%, started at 5%)<BR>- 45 ups inverted are really good, just a slight arc
over the top<BR>- 45 down upright is finally straight.<BR><BR>I need to
spend some more time on it to really get a good feel, but I<BR>think the
downthrust was causing a lot of problems to this plane. I
have<BR>never had it in all aspects of flight this close yet. I am
anxious to get<BR>more time on it and see if the changes really stick.
Unfortunately on<BR>Sunday this plane is going to a buddy but I plan
on incorporating all<BR>these changes on the new Twister which is why I
wanted to get it figured<BR>out now :)<BR><BR>Any further comments? CG
is probably around 33% of MAC, but to be exact I<BR>would have to
calculate.<BR><BR>Upline snaps are as you say Bryan, on axis with no need to
lead....I was<BR>pretty happy to see that result
:)<BR><BR>Chad<BR><BR><BR>> > > From: "Chad Northeast" <<A
href="mailto:chadnortheast@shaw.ca">chadnortheast@shaw.ca</A>><BR>>
> > To: "NSRCA Mailing List" <<A
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>><BR>>
> > Sent: Monday, March 10, 2008 4:57 PM<BR>> > > Subject:
Re: [NSRCA-discussion] the joy of trim<BR>> > ><BR>> >
><BR>> > > > Ok you trim masters, here is a tricky one for
you.<BR>> > > ><BR>> > > > Bryan and I have been
through this a bit last year but I<BR>> ran out of<BR>> >
time<BR>> > > > before the Worlds to fix it and just flew with
what I had.<BR>> > > ><BR>> > > > On my Twister I
have this pesky problem, the setup is like so,<BR>> > >
><BR>> > > > wing = 1/2+ Bryans suggestion and I like
it<BR>> > > > stab = 0<BR>> > > > motor = factory
claims 2.5 down, have not measured but<BR>> could if asked,<BR>> >
I<BR>> > > > have added more to cure a problem see below<BR>>
> > > CG = has been anywhere from 275 to 300mm from TE
mostly<BR>> with the same<BR>> > > > result. Currently
its around 285-290 and it feels<BR>> good at that point.<BR>> >
45<BR>> > > > ups inverted track almost hands off if under
enough power.<BR>> > > ><BR>> > > >
Symptoms,<BR>> > > ><BR>> > > > Plane flies well, at
this setup I need 0 mix right rudder<BR>> to ele in<BR>> >
knife,<BR>> > > > and about 2% up ele with left rudder in
knife,<BR>> > > > about 1/32" down elevator with idle to fix a
downline<BR>> > > > Added downthrust as the increase in wing
inc. and more<BR>> forward CG<BR>> > really<BR>> > > >
helped the mix in knife and made rollers easier, but<BR>> forced
an<BR>> > increase in<BR>> > > > downthrust as the plane
started pulling to the canopy on<BR>> uplines.> > > Downline mix
remained the same.<BR>> > > ><BR>> > > > The big
problem I cannot resolve is this, a 45 deg down<BR>> upright
(motor<BR>> > at<BR>> > > > idle) the plane pitches to the
belly and will not track on<BR>> its own for<BR>> > any<BR>>
> > > length of time. If I switch the idle-down mix
off<BR>> its rock solid on<BR>> > that<BR>> > > >
line.<BR>> > > ><BR>> > > > I am open to all
suggestions now that I have a bit of time<BR>> to play<BR>> >
with<BR>> > > > this, I hope Bryan chimes in some more as I
would like to<BR>> continue> where<BR>> > > > we left off
last fall. If you suggest something I<BR>> will do my best
to<BR>> > give<BR>> > > > it a go and let you know how it
works (provided it doesn't<BR>> snow!)> > ><BR>> > >
> The plane is basically super locked in with this setup,<BR>> except
for the<BR>> > > > silly 45 down upright, which is a problem in
cubans and such.<BR>> > > ><BR>> > > > Comments and
thoughts from the masters are most<BR>> appreciated :) I<BR>>
> consider<BR>> > > > myself one of the, cant really trim
that well but can fly<BR>> through it<BR>> > just<BR>> > >
> fine types :)<BR>> > > ><BR>> > > >
Chad<BR>> > > ><BR>> > > >
_______________________________________________<BR>> > > >
NSRCA-discussion mailing list<BR>> > > > <A
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> > > <A
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR>>
>
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